Removable cap for typewriter keys



R.S.G'RAHAM.

REMOVABLE CAP FOR TYPEWRITER KEYS.

APPLICATION HLED FEB. 4, 1922.

l,%28,5% Patented Sept. 12,1922.

abl fit a pluralizy 'Fatented Sept. i2, 192

I (A w.

noana'r s. GRAHAM, or. new roan, n. Y., nests-non or earn-12mm 'ro wmms H.

rotnmnn, or new Y0, N. v.

anarcvsane can roe 'rvrnwnrrna new.

a lication file'riiebruary 4-, 1922. semi Kc. scams.

To all whom it may concern;

Be it known that I, Ronnn'r S. GRAHAM, residin in the city, county, and State of New ork, have invented certain new and useful Improvements in a Removable Cap for Typewriter Keys, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a rctnovabie cap for typewriter keys and the objects of the invention are to provide a removable cap that is interchangeable without reference to the index letter or numeral ot' the typewriter ks to which it is to be applied.

do the accomplishment of the above objects and to such others as may hereinafter appear the invention comprises a removable cap having a top opening made of elastic material which is arranged to interchangeof typewriter keys.

eferring to e drawings:

Figure 1 is a perspective view of the key end of a typewriter key bar provided with a removable cap made in accordance with the invention.

Figure 2 is a top view of Fig. 1.

Figure 3 is a sectional view on the line 3-3 of Fig. 2.

Figure 4 is a sectional view on the line 44 of Fig. 2.

Figure 5 is a bottom view of Fig. l the key bar being shown in section.

In the drawing A designates the key end of an ordinary typewriter key bar which is provided in the present instance with the usual typewriter key comprising, a circular disk B having on its upper surface an index letter or numeral, the same being covered with a circular disk of glass, both supported on a metal key base D having an upturned edge E and a shank F secured to the upturned. portion of the key bar. The disks B and C are held in position on the top of the key base I) by means of a circular flange G surroundiiw the outer edge of the upturned edge and crimped over the top thereof and the circumierential edges of the disks B and C.

The typewriter key above described is similar to the typewriter keys in use on a great variety of typewriters and is adapted to he covered by a removable resilient inbher cap Hunade in accordance with the present invention.

The-typewriter key cap H is preferably, made of rubber suitably molded to provide a hollow disk shaped cap which is provided with a base (Ll having an opening I) which permits of the cap being stretched over the circumferential edge of the circular flange G to tightly engage the typewriter key as shown in the drawings.

Th key cap H is, in accordance with the present invention, provided with a top open ing so as to make visible the index letter or numeral on the disk B. In the present instance the top opening in the key cap H is made greater in length than in breadth the greater length being in the direction of the key bar to more easily show the index letter or numeral, although if desired the top openmg can be made round or other convenient shape to expose the index letter or numeral.

To securely hold the key cap H in position and also to provide a. resilient working surface for the fingers of the operator the same is provided with comparatively thick side cushion members 0 on the circumference of the top opening, as shown in Fig. 3 which preferably do not exwnd all the way around the circumference but terminate in end cushion members d as shown in Fig. 4. The side cushion members 0 and end cushion members (i are preferably formed in the shape of a, downwardly extending lip so as to securely engage the crimped end oi. the circular flange G. The end cushion members (1 are also preferably in line with the base opening 25' so as to facilitate the cap being readily stretched over the key, the end cushion memher (I being comparatively thin facilitating this operation.

From the above description it will be seen that a resilient typewriter key cap is provided that is inter-cliangcablc, due to the fact that the same is provided with a top opening through which the index letter or numeral can be seen, which makes it possible to interchangethe caps from one typewriter key to another or replace the same at will without reference to key index letter or numeral.

The intercl'iangeable feature of the rap is im portant for the reason that it one wears out or breaks it can easily be replaced with another without reference to the index letter or numeral as will be readily understood.

It will also be seen that a cap made as above described will cushion the fingers of the operator and will effectively prevent sli ping of the fingers.

hile the invention has been described .with particular reference to the details of construction the same is not to beconsidered as limited thereto as many changes can be made and still fail within the scope of the invention set fortl in the following claims.

What I claim is: I

1. A cap for a typewriter keyerra nged to be removably secured thereto, the top of said cap being provided withfside-zmd end cushion members, said side members being broader than said end members, and an opening in the top of said cap surrounded by said cushion members.

2. A cap for a typewriter key made in the form of a hollow disk having a bottom member provided with an opening to permit of the same being stretched over a, typewriter k v ,the top of saigl cap l eing provided with site and end cushion members, said side members being broader than said end members, and an opening in the top of said cap surrounded by said cushion members.

3. A cap for a. typewriter key made in the form of a hollow disk having a bottom member provided with an opening to permit of the same beii stretched over a typewriter key, the top of said cap being provided with side and end cushion members havinga downwardly extending lip said side fnembers being broader than said end members, and an opening in the top of said cap surrounded by said cushion members.

In testimony whereof I have signed this specification in the presence oi two subscribmg witnesses.

' ROBERT S. GRAHAM. Witnesses v LEO J. MA'i'rY, HENRY W. Snres. 

